The success of a Covid-19 vaccine will hinge on its delivery

Even if we get the vaccine we need, we mustn’t fail to get it to the people who need it. We are facing a potential shortage of health care workers to manage mass vaccination efforts, and risk increasing disease transmission by asking people to come for Covid-19 vaccination. If there are not enough doses for everyone, deciding who should get vaccinated within and across countries will need to be prioritized; although this may be a function of whether the vaccine works well enough in particular populations, such as older adults.  STAT